Question: 6 d A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with

6 d A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results : Machine #1 measurements (23, 24, 21, 16); Machine #12 measurements [ 17. 16, 20, 22]: Machine #3 measurements [ 19, 12, 14, 21). Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? out of question O a. 24.35and 13.15 Ob 26.57and 10.93 OC 20.82and 16.68 O d. 41.75and -4.25

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